John broughton



J. BROUGHTON.

Grinding Mm. No. 26,412. PatentedDc'JS,1859L GRINDIN MI L.

Specification of Letters Patent No. 26,412, dated pecemb To all whomitma'y concern:

Be it known that I,Jo1r1v the city, county, and State of New York, haveinvented a new and Improved Grinding-Mill and I do hereby declare.thatthe following is a full, clear, and exact descriptionofgthe same,reference being bad to the annexed drawings, making apart of this cientto prevent the mill clogging,

specificatiomin which- H Figurel, is a vertical section of my invention,takenin the line :0, w, Fig. 2. Fig. 2, is a vertical section of ditto,taken injthe line y, y, Fig. 1, and viewedin the direction indicated byarrow 1. Fig. 3, is a vertical section of ditto, also taken in the liney, y,

. Fig. 1, but viewed in the direction indicated by arrow 2.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to certain improvements in metallic grindingmills, the

class formed of a cone or frustum of a cone revolving Within aco-centric and stationary shell. i

The object of the invention is to prevent the clogging and consequentheating of the mill and at the same time obtain a perfect and rapidgrinding'operation with a very simple and economical arrangement ofparts.

The grinding mills of this class hitherto constructed possess a seriousdefect, which arises from the following causes, viz., in

order to prevent the clogging and consequent heating of the grindingsurfaces and insure a rapid discharge of the meal, the teeth are formedat an angle or in a winding direction upon the surface of the cone, theconsequence of which is that owing to the centrifugal action throwingthe meal in a direction at right angles with theedge of' the teeth, alarge portion is allowed to escape 1 in a coarse or unground state, thisbeing invariably the case where the angle is sufli any diminution of theangle of the teeth, or an increase of rinding surface in order to insurethe meal being properly and finely ground before it is discharged asinvariably results in an increase of friction and clog ging and aconsequent heatingof the grinding surfaces and meal.

In the construction and arrangement hereinafter shown the abovedescribed defect is entirely obviated, and while the capacity of eatlyincreased the cost of the mill is manufacture 1s considerably reduced.

bearing 6, which h longitudinally in part of the case, spout 0?, depends'grain or other substance to I To enable those understand and con willproceed to des represents ah. drum supported" at a rights a, a, or. anyp,

case or drum A, is.

back end is closed; a

shown clearly inIjFi B is a revolv ng gr d E, is a stationary grinderbolted by the fianches F, to the open end of drumAf. t

G, is a vertical spout commun' atin with the interior of the stationaryg der E, and into which spout thefigrain other substance to be groundgisfed fr nfa suitable hopper. 1 H, is the front bearing of the revolvingshaft and I, the driving ulleyg 1 1 J, J, are wings] or fan blades. Twoor' more of these or iblades ma be *used and they may be castfl on or,secured to the revolving grinder B. fThe revolving grinder B,consistsfof an obtuse cone provided at its. base with the co-cen trioand conical rimor fianch K, theinterior or grinding surface of whichinrelation tor its axis forms the oppositeor everseangl of the cone B,while the surf e of thens tionary grinder J, i I with it. l i

This arrangement of double conical, grlnd ing surfaces has theefl'ect ofchanging jo reversing the action of theniill upon th ground, first it isthe convex surfaceof a revolving acting within the concave surface of ationary shell, and lastly, the;concave surface 1 of a revolving shellacting uponjthe convexl surface ofa stationary cone p f The operation isa sfollo Grrain or other substance is fed into the spout G, and if inlumps or massesjsufliciently large, is first operated upon andreducedbythe cob cutter or crusher D and serratedsurface of I I theshell in which the cutter or [crusher D, rotates. It then passes betweenthe convex surface of the revolving cone B, and the concave surfaceofthe stationary grinder p 2 I r 26,412

trifugal action ofathe revolving grinder causes the meal to cling to,instead of be-.

ing thrown from, the concave surface of the revolving rim or flanch K,thus insuring its being perfectly crushed and ground previous to'beingdischarged at. the spout E, the sudden increase "in the diameter of therevolving grinder insuring the meal being carried through andeffectually preventing all'tendency to clog. The wings or fan'- bladesJ, revolving within the close case or drum A, draw a current of air downthe feed spout G, and through and between the grinding surfaces into thehollow case or drum A, from whence it is discharged by the spout d. Thiscurrent of air constantly passing between the grinding surfaces,

serves to keep them cool and effectually prevents heating and aconsequent spoiling of the meal. It also serves to draw through thegrain and meal independently of the angle at which the teeth are formedon the grinding surfaces, and also'increases the capacity of the mill byallowing it to be run at a greater velocity without any tendency toheat. The proximity of the grinding surfaces may be regulated byadjusting screw 0.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is,

1. The double and reverse acting conical grinding surfaces B, E,constructed and operated substantially as herein set forth. I

2. In' combination with a revolving grinder and a. hollow case or drumA, I claim thewings or fan-blades J, operating substantially as, and forthe purpose herein set forth.

JOHN BROUGI-ITON. WVitnesses 1 MIOH. HUGHES, C. M. HUGHES.

